6533b835fe1ef96bd129f34a

RESEARCH PRODUCT

Deduction theorems within RM and its extensions

Wieslaw DziobiakJanusz Czelakowski

subject

PhilosophyDeduction theoremPure mathematicsProperty (philosophy)Congruence (geometry)LogicScheme (mathematics)Relevance logicExtension (predicate logic)Algebraic numberMathematics

description

AbstractIn [13], M. Tokarz specified some infinite family of consequence operations among all ones associated with the relevant logic RM or with the extensions of RM and proved that each of them admits a deduction theorem scheme. In this paper, we show that the family is complete in a sense that if C is a consequence operation with CRM ≤ C and C admits a deduction theorem scheme, then C is equal to a consequence operation specified in [13]. In algebraic terms, this means that the only quasivarieties of Sugihara algebras with the relative congruence extension property are the quasivarieties corresponding, via the algebraization process, to the consequence operations specified in [13].

yearjournalcountryeditionlanguage
1999-03-01Journal of Symbolic Logic
https://doi.org/10.2307/2586764